set line "foo \"aaa\"zz bar \"aaa:ccc\" ccc"
set matches [regexp -all -inline {"([^"]*)"} $line]
set res {}
foreach {match capture} $matches {
lappend res $capture
}
puts $res
c2V0IGxpbmUgImZvbyBcImFhYVwienogYmFyIFwiYWFhOmNjY1wiIGNjYyIKc2V0IG1hdGNoZXMgW3JlZ2V4cCAtYWxsIC1pbmxpbmUgeyIoW14iXSopIn0gJGxpbmVdCnNldCByZXMge30KZm9yZWFjaCB7bWF0Y2ggY2FwdHVyZX0gJG1hdGNoZXMgewogICAgbGFwcGVuZCByZXMgJGNhcHR1cmUKfQpwdXRzICRyZXM=